2006-09-06 02:15:24 · 7 answers · asked by mithu 1 in Education & Reference ➔ Homework Help
Tungsten is highly ductile (it can be drawn into very thin metal wires), and it has a very high melting point, so it can heat up without worry of the filament melting away.
2006-09-06 02:21:03 · answer #1 · answered by ³√carthagebrujah 6 · 0⤊ 0⤋
Tungsten wire possesses characteristics that have provided it with a unique place in the origin and growth of the lamp industry. The lamp industry represents the largest commercial application of tungsten wire. It is used in this application because it displays excellent creep resistance at elevated temperatures. Tungsten is an attractive lamp filament material BECAUSE IT HAS AN EXTREMELY HIGH MELTING TEMPERATURE (~3680 K) AND A LOW VAPOUR PRESSURE AT HIGH TEMPERATURES. Tungsten is also intrinsically brittle and, initially, this prevented the manufacture of tungsten wire. However, at the beginning of this century William Coolidge, working at the General Electric Company, pursued the idea of deforming tungsten at elevated temperatures in order to make small diameter tungsten wire. Two important findings of his work were, first, to develop a method to work a powder metallurgy ingot down to wire by using deformation at elevated temperatures; and, second, to produce a ductile material from this deformation. Today, the ability to handle tungsten wire and coil filaments without breakage is the backbone of the whole incandescent lamp industry.
2006-09-06 09:40:17 · answer #2 · answered by lj 1 · 0⤊ 0⤋
Tungsten has the highest melting point of all metals (3422 °C; 6192 °F), and the lowest vapor pressure, so it can become hot enough to produce good light.
2006-09-06 09:25:54 · answer #3 · answered by novangelis 7 · 0⤊ 0⤋
Hi
Tungsten has a very high melting point - over 3 400oC so it doesn't burn out like other metals would when being heated by the electric current to give off light.
2006-09-08 09:25:33 · answer #4 · answered by Mark G W 2 · 0⤊ 0⤋
It is a fine strong element that can hold a current & stay hot & glowing in a vacuum for a long time.
2006-09-06 09:21:13 · answer #5 · answered by fairly smart 7 · 0⤊ 0⤋
it is not/least reactive to the gas inside the bulb(argon).it also has a high melting point so is not easy for it to melt.(around 3420 degrees celcius)
2006-09-06 09:38:52 · answer #6 · answered by Mo-kayz 1 · 0⤊ 0⤋
i think it s because it can withstand high temperatures for a long time
2006-09-06 09:19:06 · answer #7 · answered by futurepilot 1 · 0⤊ 0⤋